Experimental approach and assessment of Zr conversion coatings on Al alloy using response surface methodology

Kraš, Ana (author), Kramar, Davorin (author), Milošev, Ingrid (author)

This study extended the use of response surface methodology (RSM) to explore the experimental space, identify optimal conditions for deposition and drying, and assess factor interactions for zirconium conversion coatings on aluminium alloy 5754. Corrosion resistance in a dilute Harrison's solution was evaluated using a non-electrochemical drop test and electrochemical techniques. Surface analysis supported the electrochemical findings obtained with the chosen RSM conditions. Unlike zinc and cold-rolled steel, AA5754 exhibits heightened sensitivity to the interplay of pH, conversion time, and H$_2$ZrF$_6$ concentration, which is attributed to the presence of intermetallic particles governing cathodic reactions and the subsequent conversion processes.

• Language: English
• Keywords: aluminium, EIS, Electrochemical Impedance Spectroscopy, response surface methodology, conversion coatings
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 15 str.
• Numbering: Vol. 249, art. 112824
• PID: 20.500.12556/RUL-167612
• UDC: 620.1
• ISSN on article: 1879-0496
• DOI: 10.1016/j.corsci.2025.112824
• COBISS.SI-ID: 227651331
• Publication date in RUL: 04.03.2025

Record is a part of a journal

• Title: Corrosion science
• Shortened title: Corros. sci.
• Publisher: Elsevier
• ISSN: 1879-0496
• COBISS.SI-ID: 21379350

Licences

• License: CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Keywords: aluminij, EIS, elektrokemijska impedančna spektroskopija, metodologija odzivne površine, pretvorne prevleke